IBM 8265, Site Preparation Manual, Page: 30 / 164

14
IBM 8265: Planning and Site Preparation Guide
Power Capacity for Modules
The following tables show the power capacity (at +5.2 volts) available in non-fault
tolerant and fault-tolerant modes. When calculating the number of power supplies
required, you must also allow for the system overhead (power used by the fan units
and backplane) which is 1 Watt.
415 W AC Power Supplies:
295 W DC Power Supplies:
Using 8260 295 W AC Power Supplies
Although you can install both 8265 415 W and 8260 295 W AC power supplies in the
same switch, this should be avoided when running in power fault-tolerant mode. This
is because the lower output power supply (295 Watt) cannot backup a higher output
power supply (415 Watt). See the
IBM 8260 Nways Multiprotocol Switching Hub
Product Description , GA33-0415 for power capacities when a mixture of 415 W and
295 W AC power supplies are used.
Table 13. Power Capacity at +5.2 Volts (AC Power Supplies)
Number of Power
Supplies
Non-fault Tolerant Mode Fault Tolerant Mode
One 301 See note
Two 542 301
Three 813 542
Four 1084 813
Note: Power fault-tolerance can only be established if the unallocated
power budget (of at least one power supply) can be held in reserve.
Table 14. Power Capacity at +5.2 Volts (DC Power Supplies)
Number of Power
Supplies
Non-fault Tolerant Mode Fault Tolerant Mode
One 204 See note
Two 367 204
Three 551 367
Four 734 551
Note: Power fault-tolerance can only be established if the unallocated
power budget (of at least one power supply) can be held in reserve.